function onlyAlphabets(e)
{

var charcode = (e.charCode) ? e.charCode : ((e.keyCode) ? e.keyCode : ((e.which) ? e.which : 0));  

return (((charcode >= '65') && (charcode <= '90')) || ((charcode >= '97') && (charcode <= '122')) || (charcode=='46') || (charcode=='32') || charcode=='45'  || charcode=='8'   || charcode=='9' )
//8 - Backspace, 9 - tab, 46 - delete  

}


function BlockWhiteSpace(e)
{

var charcode = (e.charCode) ? e.charCode : ((e.keyCode) ? e.keyCode : ((e.which) ? e.which : 0));  

return (charcode != '32')
}

function onlyNumbers(e)
{
	var charcode = (e.charCode) ? e.charCode : ((e.keyCode) ? e.keyCode : ((e.which) ? e.which : 0));  
  
        if ((charcode > 47 && charcode < 58) || (charcode == 8 || charcode == 9 || charcode == 46))//8 - Backspace, 9 - tab, 46 - delete  
            return true;  
  
        return false;

}

function onlyAlphabetsNumbers(e)
{

var charcode = (e.charCode) ? e.charCode : ((e.keyCode) ? e.keyCode : ((e.which) ? e.which : 0));  

return (((charcode >= '65') && (charcode <= '90')) || (charcode > 47 && charcode < 58) || ((charcode >= '97') && (charcode <= '122')) || (charcode=='46') || (charcode=='32') || charcode=='45'  || charcode=='8'   || charcode=='9' )
//8 - Backspace, 9 - tab, 46 - delete  

}
function onlyAlphabetsNumberswith2Spe(e)
{

var charcode = (e.charCode) ? e.charCode : ((e.keyCode) ? e.keyCode : ((e.which) ? e.which : 0));  

return (((charcode >= '65') && (charcode <= '90')) || (charcode > 47 && charcode < 58) || ((charcode >= '97') && (charcode <= '122')) || (charcode=='46') || (charcode=='32') || charcode=='45'  || charcode=='8'   || charcode=='9' || charcode=='12'  || charcode=='51' || charcode=='52' )
//8 - Backspace, 9 - tab, 46 - delete  ,12 - minus,52 - dot,51-comma,50-@ ,109-hyphen

}
function onlyEmail(e)
{

var charcode = (e.charCode) ? e.charCode : ((e.keyCode) ? e.keyCode : ((e.which) ? e.which : 0));  

return (((charcode >= '65') && (charcode <= '90')) || (charcode > 47 && charcode < 58) || ((charcode >= '97') && (charcode <= '122')) || (charcode=='46') || (charcode=='32') || charcode=='45'  || charcode=='8'   || charcode=='9' || charcode=='12'  || charcode=='50' || charcode=='52' || charcode=='109')
//8 - Backspace, 9 - tab, 46 - delete  ,12 - minus,52 - dot,51-comma,50-@ ,109-hyphen

}
function feedback()
{
	s = '';	
	if(document.getElementById('nametxt').value=='')
	{
		s += 'Enter Name.\n';
	}
	if(document.getElementById('email_tb').value=='')
	{
		s += 'Enter Email.\n';
	}else
	{
		if (document.getElementById('email_tb').value.indexOf('.')=="-1" || document.getElementById('email_tb').value.indexOf('@')=="-1")
		{
			s += "Please enter your Your Email properly!";
			document.getElementById('email_tb').focus();
		
		}
	}
	if(document.getElementById('textcomm').value=='')
	{
		s += 'Enter Comment.\n';
	}
	if(s)
	  {
		alert(s);
		s='';
		return false;

	  }
}